Abstract
In order to solve the serious roadway failure in Yaoqiao coal mine, Kaiser effect was used to measure the in-situ stress in level-800m roadway. Through making samples 6 special directions on the beamed rock cores and doing acoustic experiment, the unilateral plus stress values on each direction are obtained. Through coordinate transformation, the magnitude and direction of the primary stress of the original rock were calculated. The result shows that level - 800m belongs to high stress area, and there exists certain tectonic stress. The relative position of horizontal maximum and minimum ground stress is determined, which provides reference for the roadway layout and support in Yaoqiao mine.
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